I believe you are referring to rarefaction. The "trough" of a compression / rarefaction wave is called rarefaction.
The rarefaction is the part of a compressional wave where particles are far apart. This is the region of low pressure in the wave, where particles are spread out compared to the other parts of the wave.
When the trough of a wave and the crest of a different wave meet, the waves cancel completely. This is called destructive interference.
Air particles are more closely packed near the Earth's surface due to the weight of the atmosphere compressing them together. As you go higher above the surface, the air becomes less dense and particles are more spread out.
A large amount of gas and dust spread out in an immense volume is called a nebula. Nebulas are vast clouds of interstellar material where new stars are born.
Frequency (or equivalently, wavelength) and amplitude. Frequency determines the sound's pitch (high or low). Amplitude is the volume (loud or quiet).
The rarefaction is the part of a compressional wave where particles are far apart. This is the region of low pressure in the wave, where particles are spread out compared to the other parts of the wave.
The spread-apart portion of a compressional wave is called a rarefaction. In a compressional wave, particles are pushed together (compression) and then spread apart (rarefaction) as the wave passes through a medium.
compressional waves
The region of spread out particles in a wave is called the trough. This is where the particles are at their lowest point of displacement from their equilibrium position.
The area on a compressional wave where particles are spread out is called a rarefaction. In a rarefaction, the particles are further apart compared to the surrounding areas where they are closer together. This alternating pattern of compressions and rarefactions is characteristic of a longitudinal wave such as a sound wave.
Longitudanal or compressional waves
When the waves are spread apart in a compressional wave, it is referred to as rarefaction. This is when the particles in the medium are further apart from each other compared to the compression phase, resulting in a decrease in density.
In a compressional wave, the particles are spaced farthest apart at the points of maximum rarefaction where the wave is at its trough. This is when the pressure is at its lowest and the particles are more spread out.
The particles undergo back-and-forth motion in the same direction as the wave propagation. They get compressed together in the region of high pressure and spread apart in the region of low pressure, creating a wave-like pattern of movement.
a slinky spread out and then grab a few coils and release and watch a compressional wave! Another example is a sound wave. the particles compressed together form a compression. The particles more widely spread apart form a rarefaction.slinkySound waveCompressional waves are also called mechanical waves. Examples include the plasma waves or guided waves.
this is the waves of p waves that have same direction of waves
The two types of regions in a compressional wave are compression regions, where particles are close together and experience high pressure, and rarefaction regions, where particles are spread apart and experience low pressure.